Air intake stack



FIG. 1 is an isometric view of an air intake stack showing my new design.

FIG. 2 is an isometric exploded view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a bottom view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a right side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a rear view thereof.

The broken line showing is included for the purpose of illustrating portions of the article that form no part of the claimed design. 

The ornamental design for an air intake stack, as shown and described. 